Cutroneo Mariapompea, Silipigni Letteria, Malinsky Petr, Slepicka Petr, Franco Domenico, Torrisi Lorenzo
Department of Physics (MIFT), Messina University, V. le Ferdinando Stagno d'Alcontres 31, S. Agata, 98166 Messina, Italy.
Nuclear Physics Institute, AS CR, 25068 Rez, Czech Republic.
Polymers (Basel). 2024 May 13;16(10):1390. doi: 10.3390/polym16101390.
Carbon dots (CDs), owing to their excellent photoluminescent features, have been extensively studied for physics preparation methods and for biomedical and optoelectronic device applications. The assessment of the applicability of CDs in the production of luminescent polymeric composites used in LEDs, displays, sensors, and wearable devices is being pursued. The present study reports on an original, environmentally friendly, and low-cost route for the production of carbon dots with an average size of 4 nm by laser ablation in liquid. Jointly, to prove the significance of the study for a wide range of applications, a free-standing flexible polyvinyl alcohol (PVA) composite containing photoluminescent carbon dots was manufactured. CDs were prepared using targets of porose charcoal with a density of 0.271 g/cm placed in phosphate-buffered saline (PBS) liquid solution and irradiated for 30 min by pulsed IR diode laser. The optical properties of the obtained suspension containing carbon dots were studied with UV-ViS and FTIR spectroscopies. The photoluminescence of the produced carbon dots was confirmed by the emission peak at 480 nm in the luminescence spectrum. A narrow luminescence band with a full width at half-maximum (FWHM) of less than 40 nm could be an asset in spectral emission analysis in different applications. Atomic force microscopy confirms the feasibility of manufacturing CDs in clean and biocompatible environments, paving the way for an easier and faster production route, crucial for their wider applicability.
碳点（CDs）因其优异的光致发光特性，已在物理制备方法以及生物医学和光电器件应用方面得到广泛研究。目前正在探索评估碳点在用于发光二极管、显示器、传感器和可穿戴设备的发光聚合物复合材料生产中的适用性。本研究报告了一种通过液体中的激光烧蚀制备平均尺寸为4纳米的碳点的原始、环保且低成本的方法。同时，为了证明该研究在广泛应用中的重要性，制备了一种包含光致发光碳点的独立柔性聚乙烯醇（PVA）复合材料。使用密度为0.271 g/cm³的多孔木炭靶材置于磷酸盐缓冲盐水（PBS）溶液中，并用脉冲红外二极管激光照射30分钟来制备碳点。通过紫外可见光谱和傅里叶变换红外光谱研究了所得含碳点悬浮液的光学性质。发光光谱中480纳米处的发射峰证实了所制备碳点的光致发光特性。半高宽（FWHM）小于40纳米的窄发光带在不同应用的光谱发射分析中可能是一项优势。原子力显微镜证实了在清洁且生物相容的环境中制造碳点的可行性，为更简便、快速的生产路线铺平了道路，这对其更广泛的应用至关重要。
